Sheet metal blank development - elliptical cone

Discussion in 'AutoCAD' started by Nick, Oct 21, 2004.

  1. Nick

    Nick Guest


    We manufacture vessels fabricated from flat steel sheet, designed
    using AutoCad LT98. We want to have the ability to produce blank
    developments automatically from the CAD, specifically the blank
    development of elliptical cone frustum shapes (circle at top of cone,
    ellipse at base).

    I know that there are LISP routines which can do blank developments,
    but LT98 can't do LISP and even upgrading to LT2005 isn't going to
    help on that score. I know that solid modelling packages like Inventor
    and Solidworks can do it, but that's a huge investment for such a
    simple problem.

    So.. do you guys know of any other way that this can be done
    automatically on cad, or any lightweight programs or utilities which I
    should be looking at?

    Thanks in advance for any help you may be able to offer.

    Nick, Oct 21, 2004
  2. Nick

    Cadalot Guest

    So upgrade to IntelliCAD 5 (Latest Release) and get Lisp for less than
    1/10 of the cost of full blown AutoCAD.

    Then find the Lisp program you seek......

    Even better download the evaluation version and try it out

    Alan (Cadalot)
    Cadalot, Oct 21, 2004
  3. Nick

    Sporkman Guest

    Can a LISP routine solve the slightly thorny issue of neutral axis
    adjustment (i.e., material stretch) along bend lines? Are you dealing
    with straightforward bends rather than with forming methods? If not,
    then I'd venture to suggest that it's not "such a simple problem" after
    all. If you're dealing often with forming, nothing short of some of the
    most advanced software available will help you. If you're dealing with
    bends (not forming) then perhaps you would do well to consider moving
    from AutoCAD (LT or not) to a real MCAD design tool such as the ones you
    mention, or else buying one seat of such software and using it only when
    necessary and outputting to AutoCAD format. FYI, I create usable and
    pretty accurate flat patterns all the time and output to AutoCAD format
    from SolidWorks very easily, but the flat pattern for any but the
    simplest and mildest kind of drawing or forming operation is pure

    Mark 'Sporky' Stapleton
    Watermark Design, LLC
    Sporkman, Oct 22, 2004
  4. Nick

    jochen Guest

    In full AutoCAD you could use my BREUEL-routine (see to
    unfold any 3d-surface.
    If you have only LT - try out the variant unfoldings from
    jochen, Oct 22, 2004
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